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Stockholder's Equity (Details Textuals 1) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended		118 Months Ended
	Jul. 31, 2021	Jul. 31, 2019	Jul. 31, 2021	Sep. 22, 2011
Targeted or Tracking Stock, Stock [Line Items]
Document Period End Date	Jul. 31, 2021
Stock Repurchase [Abstract]
Stock repurchase price per share (in dollars per share)		$ 47.81
Company repurchased common stock		$ 365.0
Stock Repurchase Program 2011 [Member]
Stock Repurchase [Abstract]
Additional common stock authorized for repurchase (in shares)				80,000,000
Common stock authorized for repurchase (in shares)				196,000,000
Company repurchased common stock (in shares)		7,635,596	114,549,198
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased	81,450,802		81,450,802

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